How to apply a png texture over my material?
I suspect you are looking a way to use &quot;MIX SHADER&quot;.
check this settings:


add a MIX shader node and as inputs 2 principled BSDF (one for the plastic look, one with the texture)
as factor as MIX shader use the Alpha channel of your image
fix the UV map if needed..

Suzanne is now happy: